Daily Sunspot Evaluation
Observation Sheet Sunday, 21 April 1974
There is no typed record for this day. The values below were read by computer from the table on the sheet; when in doubt, see the drawing. Details →
- Number of groups (g)
- 3
- Number of spots (f)
- 11
- Relative number (R)
- 41
- Observer
- ED
- Reading
- all checks consistent
- File
- 19740421.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 6 | -13 | 75W | 125 | |||
| 2 | C – 4 | -8 | 70W | 120 | |||
| 3 | J – 1 | 3 | 51W | 101 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.